In 1942, the CCI was incorporated into the SS-Wirtschafts-Verwaltungshauptamt under SS-Obergruppenführer Oswald Pohl as Amt D under SS-Brigadeführer Richard Glücks. The decree was signed by Arthur Liebehenschel, acting in Glücks' stead. A year later, the deteriorating war situation required further restrictions on selections, to ensure that every able-bodied worker could be put to work in the war economy. On April 27, 1943, Glücks presented a new circular decree with instructions to retire only those prisoners who were mentally ill or disabled. After these guidelines were issued, only the Hartheim Killing Facility was needed and those at Bernburg and Sonnenstein were closed, bringing the first phase of Aktion 14f13 to an end. Second phase According to a command from April 11, 1944, new guidelines were issued and began the second phase of Aktion 14f13 in which no forms were filled and selections were not made by a doctors' panel. The selection of the victims became the responsibility of camp administrations, usually the camp doctor. This did not exclude the physically ill, who were no longer fit for work, from being murdered, which was done at the camp or by transferring the prisoners to a camp that had a gas chamber, such as Mauthausen, Sachsenhausen or Auschwitz. Those being gassed at Hartheim included forced laborers from eastern Europe, who were unfit for work, Soviet prisoners of war and Hungarian Jews, as well as concentration camp inmates. The last prisoner transport to Hartheim was on December 11, 1944, ending the operation. The gas chambers at Hartheim were dismantled and traces of their use were removed, as much as possible and the castle was used as an orphanage. The number of people murdered under Aktion 14f13 is not certain but scholarly literature puts the figure at between 15,000 and 20,000 people for the period ending in 1943. List of Nazi killing centers Bernburg Killing Facility Brandenburg Killing Facility Grafeneck Killing Facility Hadamar Killing Facility Hartheim Killing Facility Sonnenstein Killing Facility See also Glossary of Nazi Germany for terms used during the Nazi era Nazi Doctors References Informational notes Citations Bibliography Walter Grode, Die "Sonderbehandlung 14f13" in den Konzentrationslagern des Dritten Reiches. Ein Beitrag zur Dynamik faschistischer Vernichtungspolitik, Lang, Frankfurt am Main (1987) Stanislaw Klodzinski, Die "Aktion 14f13". Der Transport von 575 Häftlingen von Auschwitz in das "Sanatorium Dresden" in Götz Aly (Editor), Aktion T4 1939 – 45. Die "Euthanasie"-Zentrale in der Tiergartenstraße 4, Edition